These hand power clamps have an innovative box joint design which prevents twisting and keeps the jaws square while providing greater throat depth. The patented adjustment power mechanism allows for infinite adjustments not found in standard hand clamps. You use only as much pressure as you need to securely clamp the work piece. The ergonomic handles provide a safe, comfortable grip for effective clamping operations. Pivoting non-mar clamping jaws for a uniform secure grip.